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From conflue...@apache.org
Subject [CONF] Apache Camel: Dead Letter Channel (page edited)
Date Wed, 27 Aug 2008 05:32:00 GMT
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 * Divs displaying the license information, if necessary.
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 * The shadow at the bottom of the page between the main content and the
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 * Styling of the operations box
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margin-left: 3px;
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border-bottom: none;
background: #3c78b5;
text-decoration: none;
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    -->
    </style>
</head>
<body>

<div id="PageContent">
<table class="pagecontent" border="0" cellpadding="0" cellspacing="0" width="100%"><tr>
<td valign="top" class="pagebody">

    <div class="pageheader">
        <span class="pagetitle">
            Page Edited :
            <a href="http://cwiki.apache.org/confluence/display/CAMEL">CAMEL</a>
:
            <a href="http://cwiki.apache.org/confluence/display/CAMEL/Dead+Letter+Channel">Dead
Letter Channel</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/CAMEL/Dead+Letter+Channel">Dead
Letter Channel</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~davsclaus">Claus
Ibsen</a>
            <span class="smallfont">(Aug 26, 2008)</span>.
     </p>
    <p>
      Change summary:
      <div class="greybox wiki-content"><p>CAMEL-857</p></div>
    </p>
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=49482&originalVersion=12&revisedVersion=13">(View
changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><h3><a name="DeadLetterChannel-DeadLetterChannel"></a>Dead
Letter Channel</h3>

<p>Camel supports the <span class="nobr"><a href="http://www.enterpriseintegrationpatterns.com/DeadLetterChannel.html"
title="Visit page outside Confluence" rel="nofollow">Dead Letter Channel<sup><img
class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle"
alt="" border="0"/></sup></a></span> from the <a href="/confluence/display/CAMEL/Enterprise+Integration+Patterns"
title="Enterprise Integration Patterns">EIP patterns</a> using the <span class="nobr"><a
href="http://activemq.apache.org/camel/maven/camel-core/apidocs/org/apache/camel/processor/DeadLetterChannel.html"
title="Visit page outside Confluence" rel="nofollow">DeadLetterChannel<sup><img
class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle"
alt="" border="0"/></sup></a></span> processor which is an <a href="/confluence/display/CAMEL/Error+Handler"
title="Error Handler">Error Handler</a>. </p>

<p><img src="http://www.enterpriseintegrationpatterns.com/img/DeadLetterChannelSolution.gif"
align="absmiddle" border="0" /></p>

<h4><a name="DeadLetterChannel-Redelivery"></a>Redelivery </h4>

<p>It is common for a temporary outage or database deadlock to cause a message to fail
to process; but the chances are if its tried a few more times with some time delay then it
will complete fine. So we typically wish to use some kind of redelivery policy to decide how
many times to try redeliver a message and how long to wait before redelivery attempts.</p>

<p>The <span class="nobr"><a href="http://activemq.apache.org/camel/maven/camel-core/apidocs/org/apache/camel/processor/RedeliveryPolicy.html"
title="Visit page outside Confluence" rel="nofollow">RedeliveryPolicy<sup><img
class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle"
alt="" border="0"/></sup></a></span> defines how the message is to be
redelivered. You can customize things like</p>

<ul>
	<li>how many times a message is attempted to be redelivered before it is considered
a failure and sent to the dead letter channel</li>
	<li>the initial redelivery timeout</li>
	<li>whether or not exponential backoff is used (i.e. the time between retries increases
using a backoff multiplier)</li>
	<li>whether to use collision avoidance to add some randomness to the timings</li>
</ul>


<p>Once all attempts at redelivering the message fails then the message is forwarded
to the dead letter queue.</p>

<h4><a name="DeadLetterChannel-Redeliverydefaultvalues"></a>Redelivery default
values</h4>

<p>The default redeliver policy will use the following values:</p>
<ul>
	<li>maximumRedeliveries=6</li>
	<li>initialRedeliveryDelay=1000L (1 second)</li>
	<li>maximumRedeliveryDelay = 60 * 1000L (60 seconds, <b>new option in Camel 1.4</b>)</li>
	<li>And the exponential backoff and collision avoidance is turned off.</li>
</ul>


<p>The maximum redeliver delay ensures that a delay is never longer than the value,
default 1 minute. This can happen if you turn on the exponential backoff.</p>

<p>The maximum redeliveries is the number of <b>re</b> delivery attempts.
By default Camel will try to process the exchange 1 + 6 times. 1 time for the normal attempt
and then 6 attempts as redeliveries.<br/>
Setting the maximumRedeliveries to a negative value such as -1 will then always redelivery
(unlimited).<br/>
Setting the maximumRedeliveries to 0 will disable any re delivery attempt.</p>

<h4><a name="DeadLetterChannel-Redeliveryheader"></a>Redelivery header</h4>

<p>When a message is redelivered the <span class="nobr"><a href="http://activemq.apache.org/camel/maven/camel-core/apidocs/org/apache/camel/processor/DeadLetterChannel.html"
title="Visit page outside Confluence" rel="nofollow">DeadLetterChannel<sup><img
class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle"
alt="" border="0"/></sup></a></span> will append a customizable header
to the message to indicate how many times its been redelivered. The default value is <b>org.apache.camel.redeliveryCount</b>.<br/>
The header <b>org.apache.camel.Redelivered</b> contains a boolean if the message
is redelivered or not.</p>

<h4><a name="DeadLetterChannel-ConfiguringviatheDSL"></a>Configuring via
the DSL</h4>

<p>The following example shows how to configure the  Dead Letter Channel configuration
using the <a href="/confluence/display/CAMEL/DSL" title="DSL">DSL</a></p>

<div class="code"><div class="codeContent">
<pre class="code-java">RouteBuilder builder = <span class="code-keyword">new</span>
RouteBuilder() {
    <span class="code-keyword">public</span> void configure() {
        errorHandler(deadLetterChannel(<span class="code-quote">"seda:errors"</span>));
        from(<span class="code-quote">"seda:a"</span>).to(<span class="code-quote">"seda:b"</span>);
    }
};</pre>
</div></div>

<p>You can also configure the <span class="nobr"><a href="http://activemq.apache.org/camel/maven/camel-core/apidocs/org/apache/camel/processor/RedeliveryPolicy.html"
title="Visit page outside Confluence" rel="nofollow">RedeliveryPolicy<sup><img
class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle"
alt="" border="0"/></sup></a></span> as this example shows</p>

<div class="code"><div class="codeContent">
<pre class="code-java">RouteBuilder builder = <span class="code-keyword">new</span>
RouteBuilder() {
    <span class="code-keyword">public</span> void configure() {
        errorHandler(deadLetterChannel(<span class="code-quote">"seda:errors"</span>).maximumRedeliveries(2).useExponentialBackOff());
        from(<span class="code-quote">"seda:a"</span>).to(<span class="code-quote">"seda:b"</span>);
    }
};</pre>
</div></div>

<h4><a name="DeadLetterChannel-ExceptionPolicyStrategy%28NewfeatureinCamel1.4%29"></a>ExceptionPolicyStrategy
(New feature in Camel 1.4)</h4>

<p><span class="nobr"><a href="http://activemq.apache.org/camel/maven/camel-core/apidocs/org/apache/camel/processor/exceptionpolicy/ExceptionPolicyStrategy.html"
title="Visit page outside Confluence" rel="nofollow">ExceptionPolicyStrategy<sup><img
class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle"
alt="" border="0"/></sup></a></span> is a strategy for resolving which
rule (<span class="nobr"><a href="http://activemq.apache.org/camel/maven/camel-core/apidocs/org/apache/camel/model/ExceptionType.html"
title="Visit page outside Confluence" rel="nofollow">ExceptionType<sup><img class="rendericon"
src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt=""
border="0"/></sup></a></span>) should handle the given thrown exception.</p>

<p>DeadLetterChannel supports pluggable strategies for resolving how exceptions should
be handled. It is common to how different strategies for different types of exceptions. For
instance network and IO related exceptions is more prone for network outages so the redeliver
policy could have a higher attempts, timeouts etc. Where as a NullPointerException is typically
a programming error so these kind of exception is severe and should not be redelivered. Camel
uses a default strategy <span class="nobr"><a href="http://activemq.apache.org/camel/maven/camel-core/apidocs/org/apache/camel/processor/exceptionpolicy/DefaultExceptionPolicyStrategy.html"
title="Visit page outside Confluence" rel="nofollow">DefaultExceptionPolicyStrategy<sup><img
class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle"
alt="" border="0"/></sup></a></span> that applies the following rules:</p>
<ul class="alternate" type="square">
	<li>The exception type must be configured with an Exception that is an instance of
the thrown exception</li>
	<li>If the exception type has exactly the thrown exception then its selected</li>
	<li>Otherwise the type that has an exception that is super of the thrown exception
is selected (recurring up the exception hierarchy)</li>
</ul>


<p>The example below illustrates a common exception handling configuration in Camel:</p>

<div class="code"><div class="codeContent">
<pre class="code-java">exception(NullPointerException.class)
    .maximumRedeliveries(1)
    .setHeader(MESSAGE_INFO, constant(<span class="code-quote">"Damm a NPE"</span>))
    .to(ERROR_QUEUE);

exception(IOException.class)
    .initialRedeliveryDelay(5000L)
    .maximumRedeliveries(3)
    .maximumRedeliveryDelay(30000L)
    .backOffMultiplier(1.0)
    .useExponentialBackOff()
    .setHeader(MESSAGE_INFO, constant(<span class="code-quote">"Damm somekind of IO
exception"</span>))
    .to(ERROR_QUEUE);

exception(Exception.class)
    .initialRedeliveryDelay(1000L)
    .maximumRedeliveries(2)
    .setHeader(MESSAGE_INFO, constant(<span class="code-quote">"Damm just exception"</span>))
    .to(ERROR_QUEUE);</pre>
</div></div>

<p>Here we have configured the handling of exceptions into three categories:</p>
<ul class="alternate" type="square">
	<li>NullPointerException (for special handling of these hard to track down bugs)</li>
	<li>IOException (for IO and network related issues we can attempt many times)</li>
	<li>Exception (fallback exception handling for all other kind of exceptions)</li>
</ul>


<p>Camel will with the default strategy try to select the best suited category from
above for any thrown exception.<br/>
So if a java.net.ScoketException is thrown then the IOException category will handle it. If
a NumberFormatException or CamelExchangeException is thrown it is handled by the general purpose
Exception category. </p>

<p>Camel supports pluggable exception policy strategies. See <a href="/confluence/display/CAMEL/Error+Handler"
title="Error Handler">Error Handler</a> for such details.</p>

<h4><a name="DeadLetterChannel-UsingThisPattern"></a>Using This Pattern</h4>

<p>If you would like to use this EIP Pattern then please read the <a href="/confluence/display/CAMEL/Getting+Started"
title="Getting Started">Getting Started</a>, you may also find the <a href="/confluence/display/CAMEL/Architecture"
title="Architecture">Architecture</a> useful particularly the description of <a
href="/confluence/display/CAMEL/Endpoint" title="Endpoint">Endpoint</a> and <a
href="/confluence/display/CAMEL/URIs" title="URIs">URIs</a>. Then you could try out
some of the <a href="/confluence/display/CAMEL/Examples" title="Examples">Examples</a>
first before trying this pattern out.</p></div>


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